rsh not working

From: Neelanjana Sengupta (senguptan_at_gmail.com)
Date: Tue Oct 11 2011 - 00:58:27 CDT

Dear NAMD experts,

We have installed NAMD2.8 in our cluster (Intel Xeon X5670 processors;
running RHEL5.0), which presently has rsh enabled on each node. I have a
.nodelist file of this type in my home directory:
*group main
host cn001
host cn002
.
.*

My submit script contains the foll:

*charmrun +p12 namd2 min01.inp > min01.out*

However, rsh is refusing the connection, and I get error messages of this
kind for each core:

*trying normal rsh (/usr/bin/rsh)
connect to address 10.1.128.12 port 544: Connection refused
..
Permission denied.
Charmrun> Error 1 returned from rsh (cn001:0)*
*...*

Can someone throw some light on this?

Thanks and regards,
Neelanjana

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